The carbon-oxygen double bond in the peak for the ketone group has a slightly lower value than the table suggests for a ketone.

H 13C Nuclear Magnetic Resonance (NMR) Chemical Shifts of Vanillin with properties. You may want to go over this with a teacher if you have one.

The image below is from a Nilered video How to extract Vanillin from Vanilla Sugar, where he displays the H NMR of the final product created:. MathJax reference.

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Natural origin of ascorbic acid: Validation by 13C NMR and IRMS. 1 Day, 3-Ethoxy-4-hydroxybenzaldehyde,Ethylvanillin.